A. Alvarado

Fernandez Hospital

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J. Costamagna

Universidad de Santiago de Chile

Ramón Latorre

University of Valparaíso

J. Vargas

Universidade Federal de São Carlos

G. Mena

University of Chile

Clara Blanco

Instituto Nacional del Carbón

Valeria Albertón

Hospital Fernández

Douglas Espin

CeNTech

M. Rubı́n

University of Bern

María Lucrecia Burna

Fernandez Hospital

Mauro Briceno

Universidad de Los Andes

Cooperative Institutions

Hospital Fernández

Fernandez Hospital

University of Chile

National Synchrotron Radiation Research Center

Metropolitan University of Educational Sciences

Benemérita Universidad Autónoma de Puebla

Universidad Nacional Autónoma de México

Universidad de Santiago de Chile

National University of Quilmes

University of Tehran

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ChemInform Abstract: Coordination Compounds of Copper, Nickel, and Iron with Schiff Bases Derived from Hydroxynaphthaldehydes and Salicylaldehydes

ChemInform (1993)

J. Costamagna J. Vargas Ramón Latorre A. Alvarado G. Mena

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

10.1002/chin.199312294

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Citations (1)

Coordination compounds of copper, nickel and iron with Schiff bases derived from hydroxynaphthaldehydes and salicylaldehydes

Coordination Chemistry Reviews (1992)

J. Costamagna J. Vargas Ramón Latorre A. Alvarado G. Mena

Piperazine

10.1016/0010-8545(92)80030-u

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Citations (357)

Chemical preparation of GaAs (100), (110), (111) and (112) substrates with HF:H₂O₂: citric acid:H₂O

Acta Crystallographica Section A Foundations of Crystallography (2005)

T.P. Diaz A. Alvarado E. Rosendo H. Juárez Graciela Ruth Delgadillo García

AND THIN FILMS C410 depth profile the surface disorder and possible pressure induced phase transitions.The results indicate that all of the studied compounds were changed due to the compression.The GID analysis shows that the surface regions of the compacted tolbutamide, carbamazepine and chlorpropamide tablets were disordered.The manifestations of the disordering in the diffractographs are the increased peak intensity and height and the decreased peak width.Moreover, a polymorphic phase transition was observed in chlorpropamide tablets.The biggest changes took place at the very surface of the tablets.The transitions were also dependent on the used compaction pressure.

10.1107/s0108767305082656

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WCN24-1791 PIGMENT NEPHROPATHY IN DRUMMERS: “IF YOU DON'T URINATE DARK AFTER PLAYING THE DRUMS, DID YOU REALLY PLAY THE DRUMS?"

Kidney International Reports (2024)

Joaquín Martinez Serventi Valeria Albertón Ricardo Heguilén María Lucrecia Burna Ignacio Eduardo Chidid

Pigmenturia is common among individuals who regularly play the drums, it is even recognized as a sign of talent and success in the drummers community. We report a serie of three argentine percussionists who presented dark-colored urine and acute kidney injury after an intense and prolonged hand-drumming session. We also describe its epidemiological characteristics.

Urination

10.1016/j.ekir.2024.02.058

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Compact and Highly Efficient Heat Exchanger Based on Packed Beds of Nanoparticle-Doped Spheres

A. Alvarado E.. Lancon Clara Blanco Mauro Briceno Douglas Espin

Abstract In this work, we demonstrate at a laboratory scale the possibility of using a radio frequency (RF) heating system as a heat exchanger, with future applications for heavy oil processing. This laboratory work is the base for further improvements in heavy oil operations. The system consists of a pipe packed with nanoparticle-doped, superparamagnetic spheres as the bed material. The experimental results are compared to the data obtained with a volume average numerical method. In the RF heating system, the spheres are excited when subjected to oscillating electric fields ensuing thermal energy dissipation; this mechanism is called the Neel relaxation, a type of electrical induction heating. We have tested this system’s performance using water and heavy crude oil flowing in non-electrically conductive ceramic pipes packed with different sizes and spheres materials. Pressure, temperature and electric consumption data corresponding to varying flow rates have been collected and the numerically solved heat transfer equations are used to extend the system characterization; this will allow for industrial apparatus design considerations. Steady state data indicate that fluid heating is achieved at smaller residence times than in conventional heaters; temperature can be controlled with a great accuracy by varying the parameters of the RF generator. When heat leakage could be contained (through insulating the pipe outer wall and relatively low temperature gradients), heating efficiencies were significantly higher than 80 %. The volume average numerical method shows that the liquid flowing through the packed bed gets uniformly heated. Thermal and flow characterization are achieved for Reynolds and Nusselt numbers in the range of 10−2−102 respectively. This set up is able to heat in an efficient and temperature accurate manner for a wide range of flow conditions, and can be potentially used as a highly efficient heat exchanger for production operations (e.g., steam generation) in areas where the construction of surface facilities (fuel storage tanks, boilers) is not possible, either for environmental reasons or for lack of land space. A RF heat exchanger would only require a reliable source of electricity.

Heating element

10.2118/181179-ms

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